I This is 13.5% degradation over less than 2 year period.
No comment on the warranty stuff but for the degradation test.
You need to drive in about the same speed, using up the energy in about the same time.
Preferably the same road used at same speed or same average power.
I checked the cell voltages via ODBii reader and the cells are at around 3.16-3.17V under an equilibrium state (after ~1hr rest).
Tesla use 4.5% buffer below 0% SOC shown on the screen.Checking an academic NCA OCV curve this is inline with approximately 3% SoC.
3% SOC on the screen should be about 7.5% true SOC.
You wont see the OVC in a OBD-tool, as the connectors isnt open when checking, and the battery do not get the OCV until the car falls asleep so you would like more than one hour parked.
When reading the voltage at low SOC, lights, AC and anything need to be shut of as it lowers the voltage with the load.
Anyway, looks that 3% on screen SOC was probable.
What is your regular charging level?Subjective: I rarely ever charge to 100% (probably less than 15 times) and never let the vehicle sit at high SoC.
When do you charge? ”Coming home after work”?
Having the car at high SOC ( higher than about 60%) in warm climates will degrade the battery faster.